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Re: 91 c1500 stutter on acceleration
It should have set a trouble and turned the light on.
Just because parts are new does not mean they are any good.
If the ECM was a rebuilt unit, it does not suprise me if it is bad.
It looks like the ECM is bad.
You should see O2 readings swinging from close to .1 up to .9 of a volt if everything is working well. The little lower voltage indicates it is running a little rich. Don't expect a perfect voltage reading on a vehicle that is not running right.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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